switch-statement

问题 I'm currently attempting to change tabs from inside of other activities -- that much is straight forward. However, I'm having trouble when attempting to set the visibility of other tabs. Essentially, I have an application load to a tab (login page) and the other tabs are invisible until the user logs in. When the user logs in, I want to make the other tabs visible and the login tab invisible. If there is a simple way of doing this, please make me aware of it--I'm currently running around in

问题 I have a case here where the switch statement contains about 40 cases of each returning a different configured object based on input. This method is shown as having too high cyclomatic complexity in the metrics and usually I would change this into a map of handler objects. But this switch sits in a piece of code where performance is all-important so I came up with the question of how a HashMap lookup and handler call compares to a switch block execution performance-wise. Anyone compared that

问题 I started writing a DCPU-16 emulator using this v1.7 spec. I started laying down the architecture, and I don't like the fact that I'm using very long switch statements. This is my first time writing an emulator, and so I don't know if there's better way to be doing it. While the switches aren't that large, due to the DCPU's small number of opcodes (and the fact that I haven't actually implemented the instructions yet), I can imagine if I were writing an emulator for a larger instruction set

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I have the code below (which actually is much longer than you see!) foreach (SensorPair sensor in _sensorPairs) { sensorByte = (byte)

问题 I was curious as to the speed on switch , believing that it was "very" fast, but I have a test case that seems to show a single switch is about as fast as about 4 if tests, when I expected (no solid reason) it to be as fast as 1 test. Here's the two methods I wrote to compare switch with if : public static int useSwitch(int i) { switch (i) { case 1: return 2; case 2: return 3; case 3: return 4; case 4: return 5; case 5: return 6; case 6: return 7; default: return 0; } } public static int

问题 my code has 3 classes n_hexa,n_octa,n_bin. The code is here switch(choice) { case 1: cin>>n; n_hexa nx(n); break; case 2: cin>>n; n_octa no(n); break; case 3: cin>>n; n_bin nb(n); break; } on compiling it gives a message " crosses initialisation of n_hexa " for line of n_octa 回答1: If you want to have temporary objects inside a case, you'll need to scope them properly. switch(choice) { case 1: { cin>>n; n_hexa nx(n); break; } case 2: { cin>>n; n_octa no(n); break; } case 3: { cin>>n; n_bin nb

问题 I edited the post for a better understanding. This is my first project as a student-trainee. It is an equipment monitoring system that keeps a record of computer equipment. This is part of code in a page that contains a filtering option and a table that displays a list of computer equipment. The filtering option contains several radio buttons that belongs to two categories which are State and Condition. Please see the components of the two categories at the end of the post. The components are

问题 I use selenium Web Driver. I have opened a parent window. After I click on the link the new window opens. I choose some value from the list and this window automatically closes. Now I need to operate in my parent window. How can I do this? I tried the following code: String HandleBefore = driver.getWindowHandle(); driver.findElement(By.xpath("...")).click(); for (String Handle : driver.getWindowHandles()) { driver.switchTo().window(Handle);} driver.findElement(By.linkText("...")).click();

问题 In the following C# code, cboRole returns a Guid. I'm then trying to use it in a switch statement to do some actions. cboRole can return only 4 different Guid so I think a switch is a good option for me. The thing is that all the case are ignored and I always get the default action. When I debug I clearly see that cboRole return a value like in the following printscreen. What is the correct way to "compare" Guids in a C# switch statement Code: if (!cboRole.IsNull) { switch (cboRole.EditValue

问题 In the following C# code, cboRole returns a Guid. I'm then trying to use it in a switch statement to do some actions. cboRole can return only 4 different Guid so I think a switch is a good option for me. The thing is that all the case are ignored and I always get the default action. When I debug I clearly see that cboRole return a value like in the following printscreen. What is the correct way to "compare" Guids in a C# switch statement Code: if (!cboRole.IsNull) { switch (cboRole.EditValue